Compilare: main.cpp: In function 'void afis(int, int)': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < node[pos].size(); i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void go_visit(int)': main.cpp:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < node[pos].size(); i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:9: warning: unused variable 'pos' [-Wunused-variable] int pos = vf[i].f.f; ^~~ main.cpp:97:9: warning: unused variable 'finish' [-Wunused-variable] int finish = vf[i].s.f; ^~~~~~